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b in (-oo:+oo)
-78 = 5*b+3*b+2 // - 5*b+3*b+2
-(5*b)-(3*b)-78-2 = 0
-5*b-3*b-78-2 = 0
-8*b-80 = 0 // + 80
-8*b = 80 // : -8
b = 80/(-8)
b = -10
b = -10
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